GitLab

Metadata usage in gallery is not touched yet.
This change includes metadata eviction.
Also localized one metadata string value.

BUG=129347
TEST=Nothing changed for user.
Review URL: https://chromiumcodereview.appspot.com/10384155

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138465 0039d316-1c4b-4281-b951-d872f2087c98